MCQOPTIONS
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MCQOPTIONS
This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Analog Communications knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Find the power saving for DSB-SC wave with 100% modulation? |
| A. | 66% |
| B. | 86% |
| C. | 50% |
| D. | 33% |
| Answer» B. 86% | |
| 2. |
If a wave is modulated by two waves. One of them has modulation index equal to 0.75 and other has 0.2, the total modulation index will be ________ |
| A. | 0.67 |
| B. | 0.58 |
| C. | 0.77 |
| D. | 0.35 |
| Answer» D. 0.35 | |
| 3. |
Power of carrier wave is 300W and modulation index is 0.75. Find its total power? |
| A. | 465W |
| B. | 384W |
| C. | 323W |
| D. | 502W |
| Answer» C. 323W | |
| 4. |
For 50% modulation, power in each sideband is ________ of that of carrier. |
| A. | 10% |
| B. | 4.32% |
| C. | 5% |
| D. | 6.25% |
| Answer» E. | |
| 5. |
24 channels, each band limited to 3.4 KHz, are to be time division multiplexed. Find the bandwidth required for 128 quantization level? (Given that sampling frequency is 8 KHz) |
| A. | 2436 KHz |
| B. | 1002 KHz |
| C. | 1536 KHz |
| D. | 1337 KHz |
| Answer» D. 1337 KHz | |
| 6. |
POWER_OF_CARRIER_WAVE_IS_300W_AND_MODULATION_INDEX_IS_0.75._FIND_ITS_TOTAL_POWER??$ |
| A. | 465W |
| B. | 384W |
| C. | 323W |
| D. | 502W |
| Answer» C. 323W | |
| 7. |
Find the power saving for DSB-SC wave with 100% modulation?$ |
| A. | 66% |
| B. | 86% |
| C. | 50% |
| D. | 33% |
| Answer» B. 86% | |
| 8. |
If_a_wave_is_modulated_by_two_waves._One_of_them_has_modulation_index_equal_to_0.75_and_other_has_0.2,_the_total_modulation_index_will_be_________$ |
| A. | 0.67 |
| B. | 0.58 |
| C. | 0.77 |
| D. | 0.35 |
| Answer» D. 0.35 | |
| 9. |
Find the number of pulses, if the number of level is 128 in PCM? |
| A. | 3 |
| B. | 6 |
| C. | 4 |
| D. | 7 |
| Answer» E. | |
| 10. |
If power transmitted is 45kW, field at a distance of 23km will be ________ |
| A. | 0.02 |
| B. | 0.75 |
| C. | 0.05 |
| D. | 0.03 |
| Answer» D. 0.03 | |
| 11. |
If each element of signal occupies 70ms, what will its speed? |
| A. | 11.23 bauds |
| B. | 14.28 bauds |
| C. | 17.39 bauds |
| D. | 13.33 bauds |
| Answer» C. 17.39 bauds | |
| 12. |
For 100% modulation, total power is ________ |
| A. | 1.5P<sub>c</sub> |
| B. | 2P<sub>c</sub> |
| C. | 3.75P<sub>c</sub> |
| D. | 1.25P<sub>c</sub> |
| Answer» B. 2P<sub>c</sub> | |
| 13. |
For 50% modulation, power in each sideband is ________ of that of carrier? |
| A. | 10% |
| B. | 4.32% |
| C. | 5% |
| D. | 6.25% |
| Answer» E. | |
| 14. |
Calculate power in each sideband, if power of carrier wave is 96W and there is 40% modulation in amplitude modulated signal? |
| A. | 11.84W |
| B. | 6.84W |
| C. | 3.84W |
| D. | 15.84W |
| Answer» D. 15.84W | |
| 15. |
Sampling frequency of a signal is 6 KHz and is quantized using 7 bit quantizer. Find its bit rate? |
| A. | 48kbPs |
| B. | 64kbPs |
| C. | 16kbPs |
| D. | 8kbPs |
| Answer» B. 64kbPs | |
| 16. |
24 channels, each band limited to 3.4 KHz, are to be time division multiplexed. Find the bandwidth required for 128 quantization level? (Given that sampling frequency is 8 KHz) |
| A. | 2436 KHz |
| B. | 1002 KHz |
| C. | 1536 KHz |
| D. | 1337 KHz |
| Answer» D. 1337 KHz | |
| 17. |
Maximum Amplitude of an amplitude modulated 10V and minimum amplitude is 5V. Find its modulation index? |
| A. | 0.65 |
| B. | 0.9 |
| C. | 0.33 |
| D. | 1 |
| Answer» D. 1 | |
| 18. |
If peak voltage of a carrier wave is 10V, what is the peak voltage of modulating signal if modulation index is 50%? |
| A. | 10V |
| B. | 20V |
| C. | 8V |
| D. | 5V |
| Answer» E. | |